package com.gdut;

public class demo2 {
    public static void main(String[] args) {
        byte a = 10;
        byte b = 20;
        byte c =(byte)(a + b);
        System.out.println(c);
        String s = String.valueOf(a) + String.valueOf(b) + "200";
        System.out.println(s);
        System.out.println("100" + a + b);
        System.out.println("100" + (a + b));
    }
}
